Question

I have a doubt in physics. The picture is below question 6 electricity sum​

Answer 1

Explanation:

in the given circuit 1 ohm and 2 ohm resistor are in series so

Rs = R1 +R2

take R1=1ohm and R2 = 2ohm

Rs = 1ohm + 2ohm = 3ohm

in the circuit 3 ohm and 3ohm resistor in Parallel

so

1/Rp = 1/Rs + 1/R3

where

R3 = Rs = 3ohm

so

1/Rp = 1/3 ohm + 1/3ohm

1/Rp = 2/3ohm

Rp = 3/2ohm

Rp = 1.5ohm

internal resistance= 0.5ohm

so total resistance = 1.5 ohm + 0.5ohm = 2ohm

• 2. We know that from ohm law
• v = iR
• i = v/R
• i = 2v/2 = 1 ampere

• 3. New voltage = 4v

New resistance = 2 .5 ohm

i = 4/2.5 = 40/25 = 1.6A